Sink



FIG. 1 is a perspective view of a sink showing our new design;

FIG. 2 is a front elevationd view of FIG. 1;

FIG. 3 is a rear elevational view of FIG. 1;

FIG. 4 is a left side view of FIG. 1;

FIG. 5 is a right side view of FIG. 1;

FIG. 6 is a top plan view of FIG. 1; and,

FIG. 7 is a bottom plan view of FIG. 1. 

CLAIM The ornamental design for a sink, as shown and described. 